Where: Book a ride on the London Eye, the city's iconic riverside Ferris wheel, for a proposal with mind-blowing views. You can rent a private pod to guarantee privacy. Other options include a Champagne picnic in the 791 acre expanse of Hampstead Heath—spread a rug out to enjoy panoramic views or sneak into secret woods. Or if the weather isn't on your side, test out the Whispering Gallery in St. Paul's Cathedral with a softly spoken "Will you&?"

Why: A proposal in Britain's most historic and multicultural city will lend the moment some gravitas.

Where to stay: Check into a pretty pied-à-terre at witty British bolt-hole the Haymarket Hotel, located in the heart of central London's theater district.